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Packing Magnetic Nozzles in an Array

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR

Abstract

Whenever magnetic ink jet nozzles are closely packaged in an array, cross talk becomes a problem due to the magnetic coupling between adjacent transducers. This is so, since the transducers are generally magnetic cores having a gap, which is in a plane parallel to the plane of the nozzle plate and perpendicular to the plane of the ink jet flow. Accordingly, the magnetic fields of adjacent transducers tend to couple to one another, resulting in cross talk.

Country

United States

Language

English (United States)

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Packing Magnetic Nozzles in an Array

Whenever magnetic ink jet nozzles are closely packaged in an array, cross
talk becomes a problem due to the magnetic coupling between adjacent
transducers. This is so, since the transducers are generally magnetic cores
having a gap, which is in a plane parallel to the plane of the nozzle plate and
perpendicular to the plane of the ink jet flow. Accordingly, the magnetic fields of
adjacent transducers tend to couple to one another, resulting in cross talk.

Fig. 1 illustrates a magnetic ink jet nozzle and selector circuit in which the
magnetic ink jet stream forms part of the magnetic circuit, resulting in a
substantial reduction in cross talk.

A magnetic ink jet reservoir 2 has a nozzle plate 4 attached thereto. An ink jet
stream 6 issues from a nozzle 8 in a known manner. The selection of drops 10 is
controlled by a transducer 12, which comprises a member 14 which is attached
to the magnetic nozzle plate 4. A signal source 16 is coupled to a coil 18 which
is wound around member 14.

In response to current flow from the source 16 through the coil 18, magnetic
flux flows through the member 14, reservoir 2, and ink jet stream 6 as indicated
by the arrow 20. This is so since the ink is magnetic.

In practice, the tip 22 of the member 14 is placed on the order of one mil from
the ink jet stream 6. In such an arrangement, respective nozzles 8 in an array
may be placed on the order of 10 mils apart.